Quiz: Do you know impeachment?

Democrats say Republicans want to impeach President Barack Obama. Republicans say Democrats are just using the specter of impeachment to energize the base. Either way, there has been plenty of rhetoric about the “I-word” in recent days, and the numbers might back that up — a recent CNN/ORC International poll showed 33 percent of Americans support impeaching the president. How well do you know the history of impeachment in the U.S.?